tensorflow--四则运算

import tensorflow as tf

sess = tf.Session()     #创建会话
a = tf.constant(3)
b = tf.constant(5)      #常量数据
c = tf.Variable(9)
# 加减乘除操作
myadd = tf.add(a,b)
mysub = tf.subtract(a,b)
mymul = tf.multiply(a,b)
mydi = tf.divide(a,b)
vadd = tf.add(a,c)
datacopy = tf.assign(c,vadd)        #赋值方法
init = tf.global_variables_initializer()
with sess:
    sess.run(init)
    print(sess.run(myadd))
    print(sess.run(mysub))
    print(sess.run(mymul))
    print(sess.run(mydi))
    print(sess.run(datacopy))
    print(datacopy.eval())                  #tensor.eval()另外一种运行方法